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  • 1
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    The Accuracy of Real-Time hmF2 Estimation from Ionosondes (2020)
    Molecular Diversity Preservation International
    Details
    Publication Date: 2020-08-19
    Description: A total of 4991 ionograms recorded from April 1997 to December 2017 by the Millstone Hill Digisonde (42.6°N, 288.5°E) were considered, with simultaneous Ne(h)[ISR] profiles recorded by the co-located Incoherent Scatter Radar (ISR). The entire ionogram dataset was scaled with both the Autoscala and ARTIST programs. The reliability of the hmF2 values obtained by ARTIST and Autoscala was assessed using the corresponding ISR values as a reference. Average errors Δ and the root mean square errors RMSE were computed for the whole dataset. Data analysis shows that both the Autoscala and ARTIST systems tend to underestimate hmF2 values with |Δ| in all cases less than 10 km. For high magnetic activity ARTIST offers better accuracy than Autoscala, as evidenced by RMSE[ARTIST] 〈 RMSE[Autoscala], under both daytime and nighttime conditions, and considering all hours of the day. Conversely, under low and medium magnetic activity Autoscala tends to estimate hmF2 more accurately than the ARTIST system for both daytime and nighttime conditions, when RMSE[Autoscala] 〈 RMSE[ARTIST]. However, RMSE[Autoscala] slightly exceeds RMSE[ARTIST] for the day as a whole. RMSE values are generally substantial (RMSE 〉 16 km in all cases), which places a limit on the results obtainable with real-time models that ingest ionosonde data.
    Electronic ISSN: 2072-4292
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Published by Molecular Diversity Preservation International
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  • 2
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    Climatology of Spread F over Tucumán from Massive Statistical Analysis of Autoscaled Data (2021)
    Molecular Diversity Preservation International
    Details
    Publication Date: 2021-10-15
    Description: Automatic ionogram interpretation methods developed for real-time ionospheric monitoring can be applied in retrospective studies to analyze large quantities of data. The Autoscala software, implemented for such a purpose, includes a routine for automatic detection of diffused echoes known as spread F, which appear in ionograms due to the presence of ionospheric irregularities along the radio signal path. The main objective of this routine is to reject bad quality ionograms. This new capability was used in a climatological study including a large number of ionograms recorded at the low-latitude ionospheric station of Tucumán (26.9° S, 294.6° E, magnetic latitude 15.5° S, Argentina). The study took into account different levels of geomagnetic and solar activity from 2012 to 2020. The results demonstrate the capability of Autoscala to capture the main signature characteristics of spread F and the temporal evolution of the ionosphere peak heigh hmF2, capturing the post-sunset plasma surge that precedes development of spread F. Maximum occurrence of spread F is observed in local summer, with a tendency to shift before midnight with increasing solar activity. Other new climatological details that emerged from the study are illustrated and briefly discussed, dealing with connection with geomagnetic activity, and morning hmF2 behavior after extremely marked nighttime spread F occurrence.
    Electronic ISSN: 2073-4433
    Topics: Geosciences
    Published by Molecular Diversity Preservation International
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  • 3
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    The Accuracy of Real-Time hmF2 Estimation from Ionosondes (2020)
    MDPI
    Details
    Publication Date: 2020-09-08
    Description: A total of 4991 ionograms recorded from April 1997 to December 2017 by the Millstone Hill Digisonde (42.6°N, 288.5°E) were considered, with simultaneous Ne(h)[ISR] profiles recorded by the co-located Incoherent Scatter Radar (ISR). The entire ionogram dataset was scaled with both the Autoscala and ARTIST programs. The reliability of the hmF2 values obtained by ARTIST and Autoscala was assessed using the corresponding ISR values as a reference. Average errors Δ and the root mean square errors RMSE were computed for the whole dataset. Data analysis shows that both the Autoscala and ARTIST systems tend to underestimate hmF2 values with |Δ| in all cases less than 10 km. For high magnetic activity ARTIST offers better accuracy than Autoscala, as evidenced by RMSE[ARTIST] 〈 RMSE[Autoscala], under both daytime and nighttime conditions, and considering all hours of the day. Conversely, under low and medium magnetic activity Autoscala tends to estimate hmF2 more accurately than the ARTIST system for both daytime and nighttime conditions, when RMSE[Autoscala] 〈 RMSE[ARTIST]. However, RMSE[Autoscala] slightly exceeds RMSE[ARTIST] for the day as a whole. RMSE values are generally substantial (RMSE 〉 16 km in all cases), which places a limit on the results obtainable with real-time models that ingest ionosonde data.
    Description: Published
    Description: id 2671
    Description: 2A. Fisica dell'alta atmosfera
    Description: JCR Journal
    Keywords: ionosonde ; ionograms ; automatic scaling ; electron density profile ; Incoherent Scatter Radar ; real-time ionospheric models
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 4
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    Accuracy assessment of the MUF(3000) nowcasting for PECASUS Space Weather services (2020)
    IEEE
    Details
    Publication Date: 2020-10-27
    Description: The Pan-European Consortium for Aviation Space Weather User Services (PECASUS) is one of the three global Space Weather Centers appointed by the International Civil Aviation Organization (ICAO) to generate Space Weather advisories for aviation users. One of the key operational 24/7 products developed by INGV for the HF domain is the MUF(3000) nowcasting, based on a mapping procedure over Europe, which makes use of the available real-time measurements in different locations, and the Ordinary Kriging method for spatial interpolation. The outputs of this procedure have been analysed during three strong geomagnetic storms, and the results have been compared on the basis of the Root Mean Square Error values obtained between predicted and measured MUF(3000) values at two different test stations. A good accuracy is achieved during the considered storm periods, being the overall Root Mean Square Error values at the test stations less than 2 MHz. However, particular cases show that this method could miss possible sudden ionospheric perturbations, and the effect of erroneous data on the accuracy estimation.
    Description: Published
    Description: Rome (Italy)
    Description: 2A. Fisica dell'alta atmosfera
    Keywords: ionosonde ; nowcasting service ; space weather ; aviation ; HF COM
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Conference paper
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